Hi @uncler,
Does it happen when you connect the charger to power the laptop?
A blinking orange light means that the laptop is running on the battery and the battery power is less than 10%.
If the laptop has Win10 installed, create a [https://www.windowscentral.com/generate-battery-report-windows-10|Win10 battery report] to check the status of the battery.
It may be failing and possibly will need replacing.
If you search online using the battery ''part number only'', (''0B110-00230400)'' you will get results for suppliers of the battery. Alternatively just search for ''Asus X550C battery.''